SU907701A2 - Starting device for automatic connection of reserve - Google Patents

Description

(5) STARTING DEVICE FOR AUTOMATIC INCLUSION OF A RESERVE

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The invention relates to power supply and electrical power distribution schemes and can be used as a fast-start trigger for automatically switching on a pool of various consumers.

According to the main author. St. By 616689, a starting device for automatic switching of the reserve is known, which contains a voltage relay and two pulse shapers, the inputs of which are intended to be connected to the phases of the power supply sources, the shaper outputs are connected to the actuators via the corresponding AND and MEMORY elements, and one of the voltage relay outputs are connected to the executive body through the comparison circuit into which the third pulse shaper, the time element and two delay elements are inserted, with the inputs of the first and third shapers intended for

connecting to the first and third phases of one source, the input of the second driver — for connecting to the second phase of another source, the output of the third pulse driver is connected to the corresponding inputs of the AND elements, while the second relay outputs of the voltage of one power source are connected to the inputs of the MEMORY element of another source, inputs

The 10 time elements are connected to the inputs of the AND elements and the output of the MEMORY element, and the output is connected to the inputs of the comparison circuits.

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However, the inclusion of a reserve is usually associated with emergency situations in the power supply, accompanied by various power supply disturbances, which can lead to

20 to the false operation of the device. High-speed impulse starting devices are especially susceptible to interferences for: automatic switching of the reserve. The purpose of the invention is to improve the noise immunity of the device. The goal is achieved by the fact that in a starting device for automatic switching on a reserve, a chain consisting of a pulse shaper connected via an element AND to a MEMORY element is made in the form of a relaxation generator on a single junction transistor, which is connected to a zener diode and a series-connected diode and a thyristor, while the generator input is connected to the Ceres resistor and diode to the source phase, the output to the control electrode of the thyristor, and the closing contact of the actuator is one source of RC-circuit connected in parallel to a relaxation oscillator capacitance Cpd bit with the executive authority of the other source. Figure 1 shows the elemental diagram of the device; in fig. 2 - structural scheme of the facility. The shaper 1 consists of a relaxation generator 2 on a single junction transistor, a zener diode 3 connected in parallel with an RC circuit of a generator 2, a resistor and a diode 5 at the input, a diode 6 and a thyristor 7 at the output. The thyristor 7 of the imaging unit 1 is connected in series with the thyristor of the analogous imaging device 8 via a separating diode 9 and the executive body 10. This circuit receives its power from a constant current source. These two formers form a reacting organ (elements AND and MEMORY) for the reference source. The following two formers 11 and 2 form an organ for another source. And with the executive organ 13, the closing contact of which is connected to the napaJWienbHo of the capacity of the relaxator formatir vat. 1, and the actuator to parallel the capacity of the relaxer of the formerheater 12. The shaper 1 is connected to the first phase of the first source, the shaper 12 to the third phase of the first source, and the shapers 8 and 11 to the second phase of the second source. The relays 1 and 15 of the voltage are connected via elements 16 and 17 of the zerkkki to the executive bodies 13 and 10, respectively. The second outputs of the executive bodies 10 and 13 through the time relay 18 are connected to the inputs of the comparison bodies 19 and 20. To the other inputs of the comparator organs are connected the outputs of the relay I and voltage 15. The output of the organs of comparison is connected to the executive body 21. The device operates as follows. The controlled voltage is applied to the driver input through diode 5, resistor C and is limited by Zener diode 3. The capacitance of the relaxation generator is charged until the single junction transistor operates. This opens the thyristor 7 and shunts the power supply circuit of the relaxation generator. After opening the thyristor 7, the capacity of the relaxation generator is discharged. The thyristor 7 is closed after passing the half-wave of the controlled voltage and reducing the current through it below the holding current. The pulse duration is 10 20 Oe. hail., and the duration of the charge capacity of the relaxation generator 160-170 e. hail. Thus, interferences, in the form of short pulses arising from unsteady phenomena in electric networks, are quenched by a zener diode if they are superimposed on a positive half-wave of the controlled voltage and smoothed by the capacity of the relaxation generator, if they are superimposed on the negative half-wave. Since the pulses are of short duration, the capacity of the relaxation generator does not have time to charge to such an extent that thyristor 7 is opened. The feature of the single junction transistor in the relaxation generator circuit is that, in the absence of voltage on its bases, the charge on the relaxator capacity is not saved and thus, the pulse formation time remains constant all the time. Normally, the pulses of the formers 1 and 8, 11 and 12 are offset from each other by 120 e. hail. In case of failure of one of the sources, due to the escape of the motor load, the pulses are combined and the thyristors of the formers for one of the sources are constantly open, forming the element MEMORY. In this case, the actuator (usually a reed switch with a response time of 1-ms) closes its contact in the circuit of the driver for another source, shunting its capacity, which blocks the driver. In the event of a short circuit on one of the three-phase power sources, relays 14 or 15 of the voltage are triggered, from which the signals through the elements 16 or 17 of the delay go to the executive bodies 10 or 13. Thus, the proposed device is more reliable in operation, claims Starting device for automatic switching on the reserve source phase. l- source 1 ed.St. No. 616689, characterized in that, in order to improve noise immunity, the chain consisting of a pulse driver connected via the AND element to the MEMORY element is made in the form of a relaxation generator on a single junction transistor, in parallel to the RG circuit of which a zener diode is connected and connected in series the diode and the thyristor, while the generator input is connected through a resistor and djd to the source phase, the output to the control electrode of the thyristor, and the closing contact of the actuator of one source is connected to the parallel the capacitance of the RC circuit of the relaxation generator connected to the executive body of the other source; O + FizaSh source

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Claims (1)

Claim The starting device for automatic inclusion of a reserve on 907701 6 ed. No. 616689, characterized in that, in order to increase the noise immunity, the chain consisting of a pulse shaper 5 connected through an AND element to a MEMORY is made in the form of | a relaxation generator on a single-junction transistor, in parallel with the RC circuit of which a stabilizer 10 tron is connected and connected in series a diode and a thyristor, while the generator input is connected through a resistor and a diode to the source / output phase to the thyristor control electrode, and the closing contact of the actuator of one source is connected in parallel but the capacitance of the RC circuit of the relaxation generator connected to the executive body of another 20 source ί- ο-